如何在文本文件的开头插入内容？

Question

我想写一个文件，然后通过在文件的开头和结尾插入一些其他内容来修改它。

我的代码：

f = open('Blowing in the wind.txt', 'w+')
f.seek(0)
f.truncate()
f.write('''
How many roads must a man walk down

Before they call him a man

How many seas must a white dove sail

Before she sleeps in the sand
''')
content= f.read()
f.seek(0)
f.write('Blowing in the wind\n' + 'Bob\n'+content)
f.seek(0,2)
f.write('\n1962 by Warner Bros.Inc.')
f.seek(0,0)
txt= f.read()
print(txt)

结果：

Blowing in the wind
Bob
n walk down

Before they call him a man

How many seas must a white dove sail

Before she sleeps in the sand

1962 by Warner Bros.Inc.

如何防止添加的内容覆盖原始文本的第一行？

Answer 1

您可以阅读文件内容 data = f.read（）

new_data =＆＃34; start＆＃34; +数据+＆＃34;结束＆＃34;

您可以用＆＃39; w＆＃39;打开文件。模式并执行

f.write（NEW_DATA）